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- Barre of upper limbs: symptoms and causes
Barre of upper limbs: symptoms and causes
When vision is removed, weak motor neurons cause the limb to fall. The falling arm is more sensitive than using a single force test to identify weak motor neurons.
Description
An asymmetrical fall in the arms when the patient stretches the arms in a tilted position (eg. Palm up) with the eyes closed and completely in the same position. The forearms fall, the forearms are bent, and the typical wrist and elbow flexion begins from a distance and progresses closer.
Causes
Common
Brain infarction.
Brain hemorrhage.
Neck marrow injury.
Less common
Infarction hole, posterior branch inside.
Multiple sclerosis.
Mass lesions (eg. Tumor, abscess, AVM venous artery malformation).
Arm falls flat: Left-hand falls outward and rotates inward
Central motor neuron anatomy
Mechanism
When vision is removed, weak motor neurons cause the limb to fall.
Meaning
The falling arm is more sensitive than using a single force test to identify weak motor neurons.
|
|
Sensitivity |
Specificity |
Positive LR |
Negative LR |
|
The arm fell flat |
79–92% |
90–98% |
10.3 |
0.1 |
Board. Clinical utility of the arm falls flat in the unilateral lesion of the brain